[vdr] Problem with audio sync in playback - maybe caused by ntpd stepping local clock?

Bernd Juraschek vdr at bjusystems.de
Tue Oct 17 20:39:03 CEST 2006


On Tue, Oct 17, 2006 at 12:51:33AM +0200, martin wrote:
> Not sure, if this may relate to your problem, but ..
> 
> I use xine plugin and every once in a while I had a short interruption of
> sound. Today I was tail-ing -f syslog for another reason and there was this
> little glitch again! Just a very short interruption with no sound. I spent
> several weekends to find out, why xine always tells me, that "fixing sound
> card drift". I was p***ed by my hardware, but now I found out, what cause
> the problem. It's my ntpd, that steps the clock on my VDR hardware. To fix
> this, I now start ntpd with the "-x" option.
> 
> For Reference from man ntpd:
> -x     Ordinarily,  if  the time is to be adjusted more than 128 ms, it
>               is stepped, not gradually slewed.  This option forces  the
> time
>               to be slewed in all cases.

Hmm - I've configured VDR to adjust the system time. Possibly this is causing the
same problem. Should VDR doing the same as "ntpd -x"?

Greetings,
Bernd



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